Four-gang jackbox assembly



FIG. 1 is a perspective view of a four-gang jackbox assembly, showing my new design;

FIG. 2 is a top plan view;

FIG. 3 is a side elevational view, the opposite side being identical thereto;

FIG. 4 is an end elevational view, the opposite end being identical thereto; and,

FIG. 5 is a bottom plan view. 

The ornamental design for a four-gang jackbox assembly, as shown and described. 